CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

problem in modeling fluid-solid-fliud

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   March 31, 2008, 05:34
Default problem in modeling fluid-solid-fliud
  #1
reem
Guest
 
Posts: n/a
dear everyone

how to model three seprate region (fluid-solid-fluid), what would be the appropriate boundary conditions on interface region to process the convection-difusion-convection in three different materials(my problem is :fluent treaet every region seperatly with no interaction with them)

  Reply With Quote

Old   March 31, 2008, 12:07
Default Re: problem in modeling fluid-solid-fliud
  #2
rosol
Guest
 
Posts: n/a
You must specify in gambit the type of regions i.e you must coice fluid to the first zone , solid to the second and fluid to the third.in fluent you dont need to do any thing since the fluent will creat a shadow wall with the walls seperating two different adjecent regions. you need only to check that the thermal boundary condition on the interface wall to be coupled .the fluent automaticlly solve the conjugate heat transfer i.e solve the energy eqaution in all trhee zones with coupling boudry conditions.

I hope this will helpful
  Reply With Quote

Old   April 1, 2008, 05:26
Default Re: problem in modeling fluid-solid-fliud
  #3
reem
Guest
 
Posts: n/a
dear rosol I have already defined these zone in gambit(fliud and solid zones) but it seems that fluent treat each zone separately(there is no temperature gradients across the three zones ie disturbance does not travel from fluid to solid through interface boundary)

  Reply With Quote

Old   April 1, 2008, 11:05
Default Re: problem in modeling fluid-solid-fliud
  #4
rosol
Guest
 
Posts: n/a
Please check that is there are a shadow walls are created in the interface walls if so and the thermal B.C is coupled so the three zones is coupled together.f not you have aproblem in ploting the zones in gambit I think its not in dirct contact
  Reply With Quote

Old   April 2, 2008, 05:55
Default Re: problem in modeling fluid-solid-fliud
  #5
reem
Guest
 
Posts: n/a
dear rosol thanks alot for ur replay. the shadow walls are generated in fluent so i think there is no problem with interface wall, but let me know how to couple the thermal B.C. at interface wall to allow for thermal graidient at interface boundaries
  Reply With Quote

Old   April 2, 2008, 06:15
Default Re: problem in modeling fluid-solid-fliud
  #6
rosol
Guest
 
Posts: n/a
only check the therma B.C at the interface wall it must be coupled not heat flux nor temp
  Reply With Quote

Old   January 29, 2010, 00:50
Default problem in modeling fluid-solid-fliud
  #7
New Member
 
A.Siva Arunachalam
Join Date: Aug 2009
Posts: 3
Rep Power: 7
arunachalam.siva is on a distinguished road
Mr.reem
In gambit U use split option u will create the wall shadow automatically
arunachalam.siva is offline   Reply With Quote

Old   February 24, 2010, 04:13
Default
  #8
New Member
 
Chua Ang Tze
Join Date: Feb 2010
Posts: 2
Rep Power: 0
wave11 is on a distinguished road
Dear all,
i would like to know how to get the coupled boundary condition. it is not available under thermal.
also in gambit, i've already set the continuiity type to SOLID and FLUID respectively. but i couldnt get the shadow zone.
please enlighten me.
thanks in advance
wave11 is offline   Reply With Quote

Old   March 19, 2011, 06:25
Default
  #9
New Member
 
H&A
Join Date: Jul 2010
Posts: 3
Rep Power: 6
FluentNewbie is on a distinguished road
Hi reem,

First, ensure that Fluent creates "shadow walls" for each "interface", then you can go to "define", "grid interfaces" and create grid interfaces. Don't forget to check the "coupled" box.
When done, go to "boundary conditions" and choose "set" for your wall. under "Thermal" you can check the "coupled" option and define you material.

Good luck!
FluentNewbie is offline   Reply With Quote

Old   October 2, 2011, 14:32
Default
  #10
New Member
 
behnam
Join Date: Sep 2011
Location: Iran
Posts: 20
Rep Power: 5
Behnam Ghadimi is on a distinguished road
hi H&A,
i do what you said with some scrupulosity. but i couldn't be able to have coupled boundary condition.
can you help me?
thanks a lot
Behnam

Last edited by Behnam Ghadimi; October 2, 2011 at 15:36.
Behnam Ghadimi is offline   Reply With Quote

Old   October 12, 2011, 16:24
Default
  #11
New Member
 
MadhuVC
Join Date: Feb 2011
Posts: 27
Rep Power: 6
madhuvc is on a distinguished road
Behnam,

you wont be able to use coupled boundary condition if there is not shadow walls created. this will be created by default by FLUENT, when you have shared boundaries between two different regions.

You have to make sure that you have shadow walls, in which if you go to the thermal tab you can see options for coupled BC.
madhuvc is offline   Reply With Quote

Old   October 15, 2011, 06:36
Default
  #12
New Member
 
behnam
Join Date: Sep 2011
Location: Iran
Posts: 20
Rep Power: 5
Behnam Ghadimi is on a distinguished road
hi madhuvc, thanks for your replay. i did it, fluent created shadow wall.
But now i have another problem, are you know, how can we rotate a brake disc in fluent by using hexa mesh, i write UDF for dynamic mesh. fluent can rotate model with tri mesh but can't be able to rotate model with hexa meshes.
thanks
Behnam Ghadimi is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Interface Fluid/Fluid and Solid Thomas Vanneste FLUENT 0 December 16, 2008 04:40
modeling heat transfer betwwen fluid and solid Al Mazdeh CFX 0 March 13, 2008 11:35
Modeling of solid domains in fluent, no fluid flow Satish Perivilli FLUENT 2 December 1, 2005 12:41
A challegening fluid-solid problem majestywzh FLUENT 0 March 31, 2003 09:50
Problem-Thermofluid Multiphase Fluid Modeling Ajit CD-adapco 1 September 6, 2002 18:45


All times are GMT -4. The time now is 10:53.